Discussion of Cyclops lesion
- The cyclops lesion occurs with an estimated frequency of 1%–9.8% of patients following anterior cruciate ligament reconstruction.
- Although the precise cause is unknown, it is believed that uplifting of fibrocartilaginous tissue during drilling of the tibia for anterior cruciate ligament reconstruction serves as a nidus for fibrous tissue deposition.
- Pathologically, the lesion consists of central granulation tissue surrounded by dense fibrous tissue.
- The lesion was so named because of its bulbous appearance and characteristic focal areas of reddish-blue discoloration (from venous channels) that resemble an eye at arthroscopy.
- The lesion may result in loss of full extension and surgical débridement of the lesion results in restoration of full knee extension/
 Imaging Findings for Cyclops lesion
- At MR imaging, a soft-tissue mass is seen anteriorly or anterolaterally in the intercondylar notch near the tibial insertion of the reconstructed anterior cruciate ligament.
- Because of its fibrous content, a cyclops lesion typically has intermediate to low signal intensity with all pulse sequences.
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 External Links
 References for Cyclops lesion
- Patrick J. Sheldon, Deborah M. Forrester, and Thomas J. Learch. Imaging of Intraarticular Masses. RadioGraphics 2005 25: 105-119.